Lead-free piezoelectric materials have been under extensive studies recently around the world due to the environmental issues taken against Pb-based ferroelectrics. Possessing relatively high Curie temperature, piezoelectric and electromechanical properties, K1-xNaxNbO3 (KNN) based ceramics have ensured to be the most promising substitutes for Pb-based compositions for sensor and actuator applications.
In this work we have prepared KNN ceramics by normal solid state reaction with different sintering time. X-ray diffraction and Raman spectroscopy confirm the structural phase purity. Further the single phase formation is confirmed by Rietveld refinement. The surface morphology and grain size are investigated from secondary electron microscopy image. The ferroelectric property is confirmed from the well saturated hysteresis loop and leakage current study. The piezoelectric property of the samples is measured by double beam laser interferometer. Results will be presented and discussed in detail.